<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title></title>
  </head>
  <body>
      <script>
        window.addEventListener('message', function(e) {
          if (
            window.location.origin === 'file://' ||
            window.location.origin === (e.origin || e.originalEvent.origin)
          ) {
            document.documentElement.innerHTML = e.data
          }
        })
      </script>
  </body>
</html>
